<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
      <title>Document</title>
      <style>
          /*base*/
          body {
              background: #fff;
          }

          .btn {
              display: inline-block;
              padding: 4px 12px;
              margin-bottom: 0;
              font-size: 14px;
              line-height: 20px;
              text-align: center;
              vertical-align: middle;
              cursor: pointer;
              box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
              border-radius: 4px;
          }

          .btn-danger {
              color: #fff;
              background-color: #da4f49;
              border: 1px solid #bd362f;
          }

          .btn-danger:hover {
              color: #fff;
              background-color: #bd362f;
          }

          .btn:focus {
              outline: none;
          }
      </style>
  </head>
  <body>
    <div id="app"></div>
  </body>
</html>
